<?phpclass UserSessionDataAccess extends UserSessionDABase{	public function deleteHistory()	{		try {			// Get db object			$dbWriter = $this->getDbWriter();			// Execute query			$rowCount = $dbWriter->delete($this->tableName, "{$this->tableName}.createdTime < DATE_SUB( NOW( ) , INTERVAL 1 DAY ) ");			// Return boolean result			if($rowCount > 0){				return true;			}else{				return false;			}		} catch(Exception $ex) {			throw $ex;		}	}}